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How to resolve these warnings when using PROⅡ to simulate the triple-column distillation of methanol?

2019-09-27View Original

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*** Problem solution begins. ** WARNING ** The liquid enthalpy of CO2 at temperature 305.15 K is outside the acceptable range of 220 K to 290 K. ** WARNING ** The liquid enthalpy of DME at temperature 305.15 K is outside the acceptable range of 131.65 K to 250 K. Feed flash is complete; Loop 1 begins – ‘LOOP1’. ** WARNING ** The pressure of feed stream 6, ‘FEED2’, which is 1.4921, is lower than the feed tray pressure of 9.191 on tray 36. ** WARNING ** The liquid enthalpy of ACETONE at temperature 351.32 K is outside the acceptable range of 178.45 K to 329.44 K. ** WARNING ** The liquid enthalpy of MTBE at temperature 351.32 K is outside the acceptable range of 164.55 K to 328.35 K. ** WARNING ** The liquid enthalpy of ACETIC acid at temperature 411.32 K is outside the acceptable range of 289.81 K to 391.05 K. ** WARNING ** The liquid enthalpy of METHANOL at temperature 411.32 K is outside the acceptable range of 175.47 K to 400 K. ** WARNING ** The liquid enthalpy of ETHANOL at temperature 411.32 K is outside the acceptable range of 159.05 K to 390 K. ** WARNING ** The liquid enthalpy of BUTANOL at temperature 411.32 K is outside the acceptable range of 184.51 K to 390.81 K. ** WARNING ** The liquid enthalpy of PROPANOL at temperature 411.32 K is outside the acceptable range of 146.95 K to 400 K.
Reply #22019-09-30
There is a problem with the logistics conditions in your system; check the inlet temperature, pressure, and tower pressure. As an extra tip, keep in mind that simulation relies on its database and computational capabilities – if you don’t know anything at all, the results of the simulation will not be reliable.

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